flood/trunk/flood_profile.c

/* Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 *
 * Originally developed by Aaron Bannert and Justin Erenkrantz, eBuilt.
 */

#include <apr_file_io.h>
#include <apr_strings.h>
#include <apr_errno.h>

#if APR_HAVE_STRING_H
#include <string.h>    /* strncasecmp */
#endif
#if APR_HAVE_STDLIB_H
#include <stdlib.h>     /* strtol */
#endif

#include "config.h"
#include "flood_profile.h"
#include "flood_config.h"
#include "flood_net.h"

#if FLOOD_HAS_OPENSSL
#include "flood_net_ssl.h"
#endif /* FLOOD_HAS_OPENSSL */

#include "flood_round_robin.h"
#include "flood_simple_reports.h"
#include "flood_easy_reports.h"
#include "flood_socket_generic.h"
#include "flood_socket_keepalive.h"
#include "flood_report_relative_times.h"

extern apr_file_t *local_stdout;
extern apr_file_t *local_stderr;

struct profile_event_handler_t {
    const char *handler_name;
    const char *impl_name;
    void *handler;
};
typedef struct profile_event_handler_t profile_event_handler_t;

struct profile_group_handler_t {
    const char *class;
    const char *group_name;
    const char **handlers;
};
typedef struct profile_group_handler_t profile_group_handler_t;

/**
 * Generic implementation for profile_init.
 */
static apr_status_t generic_profile_init(profile_t **profile, config_t *config, const char * profile_name, apr_pool_t *pool)
{
    return APR_ENOTIMPL;
}

/**
 * Generic implementation for report_init.
 */
static apr_status_t generic_report_init(report_t **report, config_t *config, const char *profile_name, apr_pool_t *pool)
{
    /* by default, don't generate a report */
    *report = NULL;
    return APR_SUCCESS;
}

/**
 * Generic implementation for get_next_url.
 */
static apr_status_t generic_get_next_url(request_t **request, profile_t *profile)
{
    return APR_ENOTIMPL;
}

/**
 * Generic implementation for create_req.
 */
static apr_status_t generic_create_req(profile_t *profile, request_t *request)
{
    return APR_ENOTIMPL;
}

/**
 * Generic implementation for postprocess.
 */
static apr_status_t generic_postprocess(profile_t *p, request_t *req, response_t *resp)
{
    return APR_SUCCESS;
}

/**
 * Generic implementation for verify_resp.
 */
static apr_status_t generic_verify_resp(int *verified, profile_t *profile, request_t *req, response_t *resp)
{
    return APR_ENOTIMPL;
}

/**
 * Generic implementation for process_stats.
 */
static apr_status_t generic_process_stats(report_t *report, int verified, request_t *req, response_t *resp)
{
    /* by default report nothing */
    return APR_SUCCESS;
}

/**
 * Generic implementation for loop_condition.
 */
static int generic_loop_condition(profile_t *p)
{
    return 0; /* by default, don't loop */
}

/**
 * Generic implementation for request_destroy.
 */
static apr_status_t generic_request_destroy(request_t *req)
{
    return APR_SUCCESS;
}

/**
 * Generic implementation for response_destroy.
 */
static apr_status_t generic_response_destroy(response_t *resp)
{
    return APR_SUCCESS;
}

/**
 * Generic implementation for report_stats.
 */
static apr_status_t generic_report_stats(report_t *report)
{
    /* nothing to report, but not a failure */
    return APR_SUCCESS;
}

/**
 * Generic implementation for destroy_report.
 */
static apr_status_t generic_destroy_report(report_t *report)
{
    return APR_SUCCESS;
}

/**
 * Generic implementation for profile_destroy.
 */
static apr_status_t generic_profile_destroy(profile_t *p)
{
    return APR_SUCCESS;
}

const char *profile_event_handler_names[] = {
    "profile_init",
    "report_init",
    "get_next_url",
    "socket_init",
    "begin_conn",
    "create_req",
    "send_req",
    "recv_resp",
    "postprocess",
    "verify_resp",
    "process_stats",
    "loop_condition",
    "end_conn",
    "request_destroy",
    "response_destroy",
    "socket_destroy",
    "report_stats",
    "destroy_report",
    "profile_destroy",
    NULL
};

profile_event_handler_t profile_event_handlers[] = {
    {"profile_init",     "generic_profile_init",         &generic_profile_init},
    {"report_init",      "generic_report_init",          &generic_report_init},
    {"get_next_url",     "generic_get_next_url",         &generic_get_next_url},
    {"socket_init",      "generic_socket_init",          &generic_socket_init},
    {"begin_conn",       "generic_begin_conn",           &generic_begin_conn},
    {"create_req",       "generic_create_req",           &generic_create_req},
    {"send_req",         "generic_send_req",             &generic_send_req},
    {"recv_resp",        "generic_recv_resp",            &generic_recv_resp},
    {"postprocess",      "generic_postprocess",          &generic_postprocess},
    {"verify_resp",      "generic_verify_resp",          &generic_verify_resp},
    {"process_stats",    "generic_process_stats",        &generic_process_stats},
    {"loop_condition",   "generic_loop_condition",       &generic_loop_condition},
    {"end_conn",         "generic_end_conn",             &generic_end_conn},
    {"request_destroy",  "generic_request_destroy",      &generic_request_destroy},
    {"response_destroy", "generic_response_destroy",     &generic_response_destroy},
    {"socket_destroy",   "generic_socket_destroy",       &generic_socket_destroy},
    {"report_stats",     "generic_report_stats",         &generic_report_stats},
    {"destroy_report",   "generic_destroy_report",       &generic_destroy_report},
    {"profile_destroy",  "generic_profile_destroy",      &generic_profile_destroy},

    /* Alternative Implementations that are currently available: */

    /* Always retrieve the full response */
    {"recv_resp",        "generic_fullresp_recv_resp",   &generic_fullresp_recv_resp},

    /* Keep-Alive support */
    {"socket_init",      "keepalive_socket_init",    &keepalive_socket_init},
    {"begin_conn",       "keepalive_begin_conn",     &keepalive_begin_conn},
    {"send_req",         "keepalive_send_req",       &keepalive_send_req},
    {"recv_resp",        "keepalive_recv_resp",      &keepalive_recv_resp},
    {"end_conn",         "keepalive_end_conn",       &keepalive_end_conn},
    {"socket_destroy",   "keepalive_socket_destroy", &keepalive_socket_destroy},

    /* Round Robin */
    {"profile_init",     "round_robin_profile_init", &round_robin_profile_init},
    {"get_next_url",     "round_robin_get_next_url", &round_robin_get_next_url},
    {"create_req",       "round_robin_create_req",   &round_robin_create_req},
    {"postprocess",      "round_robin_postprocess",  &round_robin_postprocess},
    {"loop_condition",   "round_robin_loop_condition", &round_robin_loop_condition},
    {"profile_destroy",  "round_robin_profile_destroy",&round_robin_profile_destroy},

    /* Verification by OK/200 */
    {"verify_resp",      "verify_200",                   &verify_200},
    {"verify_resp",      "verify_status_code",           &verify_status_code},

    /* Simple Reports */
    {"report_init",      "simple_report_init",           &simple_report_init},
    {"process_stats",    "simple_process_stats",         &simple_process_stats},
    {"report_stats",     "simple_report_stats",          &simple_report_stats},
    {"destroy_report",   "simple_destroy_report",        &simple_destroy_report},

    /* Easy Reports */
    {"report_init",      "easy_report_init",             &easy_report_init},
    {"process_stats",    "easy_process_stats",           &easy_process_stats},
    {"report_stats",     "easy_report_stats",            &easy_report_stats},
    {"destroy_report",   "easy_destroy_report",          &easy_destroy_report},

    /* Relative Times Report */
    {"report_init",      "relative_times_report_init",   &relative_times_report_init},
    {"process_stats",    "relative_times_process_stats", &relative_times_process_stats},
    {"report_stats",     "relative_times_report_stats",  &relative_times_report_stats},
    {"destroy_report",   "relative_times_destroy_report",&relative_times_destroy_report},

    {NULL} /* sentinel value */
};

const char * profile_group_handler_names[] = {
    "report",
    "socket",
    "profiletype",
    NULL
};

const char * report_easy_group[] = { "easy_report_init", "easy_process_stats", "easy_report_stats", "easy_destroy_report", NULL };
const char * report_simple_group[] = { "simple_report_init", "simple_process_stats", "simple_report_stats", "simple_destroy_report", NULL };
const char * socket_generic_group[] = { "generic_socket_init", "generic_begin_conn", "generic_send_req", "generic_recv_resp", "generic_end_conn", "generic_socket_destroy", NULL };
const char * socket_keepalive_group[] = { "keepalive_socket_init", "keepalive_begin_conn", "keepalive_send_req", "keepalive_recv_resp", "keepalive_end_conn", "keepalive_socket_destroy", NULL };
const char * profile_round_robin_group[] = { "round_robin_profile_init", "round_robin_get_next_url", "round_robin_create_req", "round_robin_postprocess", "round_robin_loop_condition", "round_robin_profile_destroy", NULL };
const char * report_relative_times_group[] = { "relative_times_report_init", "relative_times_process_stats", "relative_times_report_stats", "relative_times_destroy_report", NULL };

profile_group_handler_t profile_group_handlers[] = {
    {"report", "easy", report_easy_group },
    {"report", "simple", report_simple_group },
    {"socket", "generic", socket_generic_group },
    {"socket", "keepalive", socket_keepalive_group },
    {"profiletype", "round_robin", profile_round_robin_group },
    {"report", "relative_times", report_relative_times_group },
    {NULL}
};

/**
 * Assign the appropriate implementation to the profile_events_t handler
 * for the given function name and overriden function name.
 * Returns APR_SUCCESS if an appropriate handler was found and assigned, or
 * returns APR_ENOTIMPL if no match was found.
 */
static apr_status_t assign_profile_event_handler(profile_events_t *events,
                                                 const char *handler_name,
                                                 const char *impl_name)
{
    profile_event_handler_t *p;

    for (p = &profile_event_handlers[0]; p && (*p).handler_name; p++) {
        /* these are case insensitive (both key and value) for the sake of simplicity */
        if (strncasecmp(impl_name, (*p).impl_name, FLOOD_STRLEN_MAX) == 0) {
            if (strncasecmp(handler_name, (*p).handler_name, FLOOD_STRLEN_MAX) == 0) {
                /* we got a match, assign it */

                /* stupid cascading if, no big deal since it only happens at startup */
                if (strncasecmp(handler_name, "profile_init", FLOOD_STRLEN_MAX) == 0) {
                    events->profile_init = (*p).handler;
                } else if (strncasecmp(handler_name, "report_init", FLOOD_STRLEN_MAX) == 0){ 
                    events->report_init = (*p).handler;
                } else if (strncasecmp(handler_name, "socket_init", FLOOD_STRLEN_MAX) == 0){ 
                    events->socket_init = (*p).handler;
                } else if (strncasecmp(handler_name, "get_next_url", FLOOD_STRLEN_MAX) == 0){ 
                    events->get_next_url = (*p).handler;
                } else if (strncasecmp(handler_name, "begin_conn", FLOOD_STRLEN_MAX) == 0) {
                    events->begin_conn = (*p).handler;
                } else if (strncasecmp(handler_name, "create_req", FLOOD_STRLEN_MAX) == 0) {
                    events->create_req = (*p).handler;
                } else if (strncasecmp(handler_name, "send_req", FLOOD_STRLEN_MAX) == 0) {
                    events->send_req = (*p).handler;
                } else if (strncasecmp(handler_name, "recv_resp", FLOOD_STRLEN_MAX) == 0) {
                    events->recv_resp = (*p).handler;
                } else if (strncasecmp(handler_name, "postprocess", FLOOD_STRLEN_MAX) == 0) {
                    events->postprocess = (*p).handler;
                } else if (strncasecmp(handler_name, "verify_resp", FLOOD_STRLEN_MAX) == 0) {
                    events->verify_resp = (*p).handler;
                } else if (strncasecmp(handler_name, "process_stats", FLOOD_STRLEN_MAX) == 0) {
                    events->process_stats = (*p).handler;
                } else if (strncasecmp(handler_name, "loop_condition", FLOOD_STRLEN_MAX) == 0) {
                    events->loop_condition = (*p).handler;
                } else if (strncasecmp(handler_name, "end_conn", FLOOD_STRLEN_MAX) == 0) {
                    events->end_conn = (*p).handler;
                } else if (strncasecmp(handler_name, "request_destroy", FLOOD_STRLEN_MAX) == 0) {
                    events->request_destroy = (*p).handler;
                } else if (strncasecmp(handler_name, "response_destroy", FLOOD_STRLEN_MAX) == 0) {
                    events->response_destroy = (*p).handler;
                } else if (strncasecmp(handler_name, "socket_destroy", FLOOD_STRLEN_MAX) == 0) {
                    events->socket_destroy = (*p).handler;
                } else if (strncasecmp(handler_name, "report_stats", FLOOD_STRLEN_MAX) == 0) {
                    events->report_stats = (*p).handler;
                } else if (strncasecmp(handler_name, "destroy_report", FLOOD_STRLEN_MAX) == 0) {
                    events->destroy_report = (*p).handler;
                } else if (strncasecmp(handler_name, "profile_destroy", FLOOD_STRLEN_MAX) == 0) {
                    events->profile_destroy = (*p).handler;
                } else {
                    /* some internal error, our static structs don't match up */
                    return APR_EGENERAL;
                }
                return APR_SUCCESS;
            } else {
                /* invalid implementation for this handler */
                apr_file_printf(local_stderr, "Invalid handler (%s) "
                                "specified.\n",
                                handler_name ? handler_name : "NULL");
                return APR_ENOTIMPL; /* XXX: There's probably a better return val than this? */
            }
        }
    }
    apr_file_printf(local_stderr, "Invalid implementation (%s) for "
                    "this handler (%s)\n",
                    impl_name ? impl_name : "NULL",
                    handler_name ? handler_name : "NULL");
    return APR_ENOTIMPL; /* no implementation found */
}

/**
 * Assign all functions listed in the group to the profile_events_t handler
 * Returns APR_SUCCESS if an appropriate handler was found and assigned, or
 * returns APR_NOTFOUND if no match was found.
 */
static apr_status_t assign_profile_group_handler(profile_events_t *events,
                                                 const char *class_name,
                                                 const char *group_name)
{
    profile_event_handler_t *p;
    profile_group_handler_t *g;
    const char **handlers;

    /* Find our group. */
    for (g = &profile_group_handlers[0]; g && g->class; g++) 
    {
        if (!strncasecmp(class_name, g->class, FLOOD_STRLEN_MAX) &&
            !strncasecmp(group_name, g->group_name, FLOOD_STRLEN_MAX))
            break;
    }

    if (!g->class) {
        apr_file_printf(local_stderr, "Invalid class '%s' or groupname '%s'.\n",
                        class_name, group_name);
        return APR_EGENERAL;
    }

    /* For all of the handlers, set them. */
    for (handlers = g->handlers; *handlers; handlers++)
    {
        for (p = profile_event_handlers; p && p->handler_name; p++) {
            if (!strncasecmp(p->impl_name, *handlers, FLOOD_STRLEN_MAX))
                assign_profile_event_handler(events, p->handler_name, 
                                             p->impl_name);
        }
    }
    return APR_SUCCESS;
}

/**
 * Construct a profile_event_handler_t struct, with the "generic"
 * implementations in place by default.
 */
static apr_status_t create_profile_events(profile_events_t **events, apr_pool_t *pool)
{
    apr_status_t stat;
    profile_events_t *new_events;

    if ((new_events = apr_pcalloc(pool, sizeof(profile_events_t))) == NULL)
        return APR_ENOMEM;

    if ((stat = assign_profile_event_handler(new_events,
                                             "profile_init",
                                             "generic_profile_init")) != APR_SUCCESS)
        return stat;
    if ((stat = assign_profile_event_handler(new_events,
                                             "report_init",
                                             "generic_report_init")) != APR_SUCCESS)
        return stat;
    if ((stat = assign_profile_event_handler(new_events,
                                             "socket_init",
                                             "generic_socket_init")) != APR_SUCCESS)
        return stat;
    if ((stat = assign_profile_event_handler(new_events,
                                             "get_next_url",
                                             "generic_get_next_url")) != APR_SUCCESS)
        return stat;
    if ((stat = assign_profile_event_handler(new_events,
                                             "create_req",
                                             "generic_create_req")) != APR_SUCCESS)
        return stat;
    if ((stat = assign_profile_event_handler(new_events,
                                             "begin_conn",
                                             "generic_begin_conn")) != APR_SUCCESS)
        return stat;
    if ((stat = assign_profile_event_handler(new_events,
                                             "send_req",
                                             "generic_send_req")) != APR_SUCCESS)
        return stat;
    if ((stat = assign_profile_event_handler(new_events,
                                             "recv_resp",
                                             "generic_recv_resp")) != APR_SUCCESS)
        return stat;
    if ((stat = assign_profile_event_handler(new_events,
                                             "verify_resp",
                                             "generic_verify_resp")) != APR_SUCCESS)
        return stat;
    if ((stat = assign_profile_event_handler(new_events,
                                             "postprocess",
                                             "generic_postprocess")) != APR_SUCCESS)
        return stat;
    if ((stat = assign_profile_event_handler(new_events,
                                             "process_stats",
                                             "generic_process_stats")) != APR_SUCCESS)
        return stat;
    if ((stat = assign_profile_event_handler(new_events,
                                             "loop_condition",
                                             "generic_loop_condition")) != APR_SUCCESS)
        return stat;
    if ((stat = assign_profile_event_handler(new_events,
                                             "end_conn",
                                             "generic_end_conn")) != APR_SUCCESS)
        return stat;
    if ((stat = assign_profile_event_handler(new_events,
                                             "request_destroy",
                                             "generic_request_destroy")) != APR_SUCCESS)
        return stat;
    if ((stat = assign_profile_event_handler(new_events,
                                             "response_destroy",
                                             "generic_response_destroy")) != APR_SUCCESS)
        return stat;
    if ((stat = assign_profile_event_handler(new_events,
                                             "socket_destroy",
                                             "generic_socket_destroy")) != APR_SUCCESS)
        return stat;
    if ((stat = assign_profile_event_handler(new_events,
                                             "report_stats",
                                             "generic_report_stats")) != APR_SUCCESS)
        return stat;
    if ((stat = assign_profile_event_handler(new_events,
                                             "destroy_report",
                                             "generic_destroy_report")) != APR_SUCCESS)
        return stat;
    if ((stat = assign_profile_event_handler(new_events,
                                             "profile_destroy",
                                             "generic_profile_destroy")) != APR_SUCCESS)
        return stat;

    *events = new_events;

    return APR_SUCCESS;
}

/**
 * Initializes the profile_events_t structure according to what we
 * find in the given configuration. Dynamically allocated memory
 * is pulled from the given pool.
 */
static apr_status_t initialize_events(profile_events_t **events, const char * profile_name, config_t *config, apr_pool_t *pool)
{
    apr_status_t stat;
    const char **p;
    profile_events_t *new_events;
    struct apr_xml_elem *root_elem, *profile_elem, *profile_event_elem;
    char *xml_profile;

    xml_profile = apr_pstrdup(pool, XML_PROFILE);

    if ((stat = retrieve_root_xml_elem(&root_elem, config)) != APR_SUCCESS) {
        return stat;
    }
    
    if ((stat = create_profile_events(&new_events, pool)) != APR_SUCCESS) {
        return stat;
    }

    /* retrieve our profile xml element */
    if ((stat = retrieve_xml_elem_with_childmatch(
             &profile_elem, root_elem,
             xml_profile, "name", profile_name)) != APR_SUCCESS)
        return stat;

    /* For each event in the profile_events_t struct, allow the config
     * parameters to override an implementation.
     */
    for (p = &profile_group_handler_names[0]; *p; p++) {
        stat = retrieve_xml_elem_child(&profile_event_elem, profile_elem, *p);
        /* We found a match */
        if (stat == APR_SUCCESS)
        {
            stat = assign_profile_group_handler(new_events, *p,
                   profile_event_elem->first_cdata.first->text);
            if (stat != APR_SUCCESS)
                return stat;
        }
    }

    /* For each event in the profile_events_t struct, allow the config
     * parameters to override an implementation.
     */
    for (p = &profile_event_handler_names[0]; *p; p++) {
        if ((stat = retrieve_xml_elem_child(
                 &profile_event_elem,
                 profile_elem,
                 *p)) == APR_SUCCESS) {

            /* search for the implementation in our tables and assign it */
            if ((stat = assign_profile_event_handler(
                     new_events,
                     *p,
                     profile_event_elem->first_cdata.first->text)) != APR_SUCCESS) {
#ifdef PROFILE_DEBUG
                apr_file_printf(local_stdout, "Profile '%s' failed to override '%s' with '%s'.\n",
                                profile_name, *p, profile_event_elem->first_cdata.first->text);
#endif /* PROFILE_DEBUG */
                return stat;
            } else {
#ifdef PROFILE_DEBUG
                apr_file_printf(local_stdout, "Profile '%s' overrides '%s' with '%s'.\n",
                                profile_name, *p, profile_event_elem->first_cdata.first->text);
#endif /* PROFILE_DEBUG */
            }            

        } else {
#ifdef PROFILE_DEBUG
            apr_file_printf(local_stdout, "Profile '%s' uses default '%s'.\n",
                            profile_name, *p);
#endif /* PROFILE_DEBUG */
        }
    }
    
    *events = new_events;
    
    return APR_SUCCESS;
}

/**
 * Essential guts of the main test loop -- a single run of a test profile:
 */
apr_status_t run_profile(apr_pool_t *pool, config_t *config, const char * profile_name)
{
    profile_events_t *events;
    profile_t *profile;
    report_t *report;
    request_t *req;
    response_t *resp;
    socket_t *socket;
    flood_timer_t *timer;
    apr_status_t stat;
    int verified;

    /* init to NULL for the sake of our error checking */
    events = NULL;
    profile = NULL;
    req = NULL;
    resp = NULL;
    socket = NULL;
    verified = FLOOD_INVALID;

    /* assign the implementations (function pointers) */
    if ((stat = initialize_events(&events, profile_name, config, pool)) != APR_SUCCESS) {
        return stat;
    }

    if (events == NULL) {
        apr_file_printf(local_stderr, "Error initializing test profile.\n");
        return APR_EGENERAL; /* FIXME: What error code to return? */
    }

    /* initialize this profile */
    if ((stat = events->profile_init(&profile, config, profile_name, pool)) != APR_SUCCESS)
        return stat;

    /* initialize this report */
    if ((stat = events->report_init(&report, config, profile_name, pool)) != APR_SUCCESS)
        return stat;

    /* initialize the socket */
    if ((stat = events->socket_init(&socket, pool)) != APR_SUCCESS)
        return stat;

    timer = apr_palloc(pool, sizeof(flood_timer_t));

    do {
        if ((stat = events->get_next_url(&req, profile)) != APR_SUCCESS)
            return stat;

        /* sample timer "begin" */
        timer->begin = apr_time_now();

        if ((stat = events->begin_conn(socket, req, pool)) != APR_SUCCESS) {
            apr_file_printf(local_stderr, "open request failed (%s).\n", 
                            req->uri);
            return stat;
        }

        /* connect()ion was just made, sample it */
        timer->connect = apr_time_now();

        /* FIXME: I don't like doing this after we've opened the socket.
         * But, I'm not sure how to do it otherwise.
         */
        if ((stat = events->create_req(profile, req)) != APR_SUCCESS) {
            apr_file_printf(local_stderr, "create request failed (%s).\n", 
                            req->uri);
            return stat;
        }

        /* If we wanted to keep track of our request generation overhead,
         * we could take a timer sample here */

        if ((stat = events->send_req(socket, req, pool)) != APR_SUCCESS) {
            apr_file_printf(local_stderr, "send request failed (%s).\n", 
                            req->uri);
            return stat;
        }

        /* record the time at which we finished sending the entire request */
        timer->write = apr_time_now();

        if ((stat = events->recv_resp(&resp, socket, pool)) != APR_SUCCESS) {
            apr_file_printf(local_stderr, "receive request failed (%s).\n", 
                            req->uri);
            return stat;
        }

        /* record the time at which we received the first chunk of response data */
        timer->read = apr_time_now();

        if ((stat = events->postprocess(profile, req, resp)) != APR_SUCCESS) {
            apr_file_printf(local_stderr, "postprocessing failed (%s).\n", 
                            req->uri);
            return stat;
        }

        if ((stat = events->verify_resp(&verified, profile, req, resp)) != APR_SUCCESS) {
            apr_file_printf(local_stderr, 
                            "Error while verifying query (%s).\n", req->uri);
            return stat;
        }

        if ((stat = events->end_conn(socket, req, resp)) != APR_SUCCESS) {
            apr_file_printf(local_stderr, 
                            "Unable to end the connection (%s).\n", req->uri);
            return stat;
        }

        /* record the time at which we had finished reading the entire response.
         * Note: this sample includes overhead from postprocessing and verification
         * and is not a good representation of raw server response speed. */
        timer->close = apr_time_now();

        if ((stat = events->process_stats(report, verified, req, resp, timer)) != APR_SUCCESS) {
            apr_file_printf(local_stderr, 
                            "Unable to process statistics (%s).\n", req->uri);
            return stat;
        }


        if ((stat = events->request_destroy(req)) != APR_SUCCESS) {
            apr_file_printf(local_stderr, "Error cleaning up request.\n");
            return stat;
        }

        if ((stat = events->response_destroy(resp)) != APR_SUCCESS) {
            apr_file_printf(local_stderr, "Error cleaning up Response.\n");
            return stat;
        }

        if ((stat = events->socket_destroy(socket)) != APR_SUCCESS) {
            apr_file_printf(local_stderr, "Error cleaning up Socket.\n");
            return stat;
        }

    } while (events->loop_condition(profile));

    if ((stat = events->report_stats(report)) != APR_SUCCESS) {
        apr_file_printf(local_stderr, "Unable to report statistics.\n");
        return stat;
    }

    if (events->destroy_report(report) != APR_SUCCESS) {
        apr_file_printf(local_stderr, "Error cleaning up report '%s'.\n", profile_name);
        return APR_EGENERAL; /* FIXME: What error code to return? */
    }

    if (events->profile_destroy(profile) != APR_SUCCESS) {
        apr_file_printf(local_stderr, "Error cleaning up profile '%s'.\n", profile_name);
        return APR_EGENERAL; /* FIXME: What error code to return? */
    }

    return APR_SUCCESS;
}
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